energy Flashcards
work
Work
The transfer of energy when a force moves an object, in joules.
lever
Lever
A type of machine which is a rigid bar that pivots about a point
input force
Input force
The force you apply to a machine
out put force
Output force
The force that is applied to the object moved by the machine
displacement
Displacement
The distance an object moves from its original position
deformation
Deformation
When an elastic object is
stretched or squashed, which requires work
what is work done measured in
Work done and energy transferred are measured in joules (J).
is work a form of energy
Work is not a form of energy - it is one of the ways in which energy can be transferred.
how does momentum change happen
A change in momentum happens when a force is applied to an object that is moving or is able to move.
what happens to total momentum in and explosion or collision
- The total momentum in an explosion or collision stays the same.
how do objects turn
- Forces can make objects turn if there is
a pivot.
what is the pivot
- The pivot is the fixed point somtehing will rotate around
what is the turning force around the pivot called
- Turning forces around a pivot are
called moments.
how do you work out a moment
4. If the turning forces are balanced, we say the moments are equal and opposite Working out moments To work out a moment, we need to know two things: • The distance from the pivot that the force is applied. • The size of the force applied This is the equation for working out a moment: moment = force × distance
energy
Energy
Associated with changes in temperature or with work
joule
Joule
The unit of energy, symbol J.
law of conservation of energy
Law of
conservation of energy
Energy cannot be created or destroyed, only transferred.
chemical energy
Chemical energy
Energy stored in the bonds of substances.
thermal store
Thermal store
Energy in objects as a result of the motion of their particles
kinetic store
Kinetic store
Energy of moving objects.
gravitational potential energy
Gravitational
potential energy
Energy of due to the position of an object in a gravitational field.
elastic potential energy
Elastic potential energy
Energy stored when objects change shape.
temprature
Temperature
A measure of how hot or cold something is, measured in degrees, Celsius.
conduction
Conduction
Way in which energy is transferred in solids.
convection
Convection
Transfer of energy by the movement of gases or liquids.
radiation
Radiation
Transfer of energy as a wave.
fossil fuel
Fossil fuel
Coal, oil or gas. Finite resource.
work
Work
A way of transferring energy that does not involve heating.
